EP 0227554 A2 19870701 - Differential plane mirror interferometer.
Title (en)
Differential plane mirror interferometer.
Title (de)
Differtial-Interferometer mit flachem Spiegel.
Title (fr)
Interféromètre différentiel à miroir plan.
Publication
Application
Priority
US 81099985 A 19851219
Abstract (en)
A differential plane mirror interferometer comprises a source (10) which emits a light beam (12) containing two orthogonally polarized components of different frequencies; a source of a stabilized electrical reference signal (11) of a frequency corresponding to the frequency difference between the two components of the light beam; a tilted shear plate (16) and a half-wave plate (29A) for converting said beam into two parallel beams (30,33) with the same polarization; means including a polarizing beamsplitter (40), for causing each of the beams (30,33) to be reflected twice by one of two plane mirrors (71,70) to produce two parallel output beams (60,63) with the same polarization; means including a half-wave plate (29B) and the tilted shear plate (16) for connecting said two output beams into a single output beam(80)in which the phase difference between the two components is proportional to the optical path length between the two mirrors (70,71); a photoelectric detector (83) to produce the measurement signal (85); and a phase/meter accumulator (90) to indicate the phase difference between the reference and measurement signals (11,85) which is proportional to the changes in the optical path length between said two mirrors.
IPC 1-7
IPC 8 full level
G02B 27/28 (2006.01); G01B 9/02 (2006.01); G01D 5/26 (2006.01); G01J 9/02 (2006.01)
CPC (source: EP US)
G01B 9/02018 (2013.01 - EP US); G01B 9/02057 (2013.01 - EP US); G01D 5/266 (2013.01 - EP US); G01J 9/0215 (2013.01 - EP US); G01B 2290/70 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0227554 A2 19870701; EP 0227554 A3 19900124; EP 0227554 B1 19950308; DE 227554 T1 19880225; DE 3650262 D1 19950413; DE 3650262 T2 19950706; JP H0715363 B2 19950222; JP S62235506 A 19871015; US 4752133 A 19880621
DOCDB simple family (application)
EP 86402882 A 19861219; DE 3650262 T 19861219; DE 86402882 T 19861219; JP 30111286 A 19861216; US 81099985 A 19851219